php keep dynamically generated radio button checked after submit

Question

I know there are other topics covering this, but I read through them, tried the solutions, and am still running into issues.

I have an array, $genderValues, that I loop through in order to echo two radio buttons inside of a form. The form has other inputs with validation. When the user checks male or female, I want that radio button to remain checked when they try to submit the form but fail to meet other validation, rather than having it clear itself.

$genderValues = ['Male','Female'];

function ending ($genderVal) {

        if (isset($_POST['gender']) && ($_POST['gender'] == $genderVal)) {
            $ending = " checked />";
                return $ending;
        }
        else{
            $ending = "/>";
            return $ending;
         }
    }

    foreach($genderValues as $genderVal){

        echo "<label class='radio' for=" . $genderVal . ">" . $genderVal . "</label>
        <input type='radio' name='gender' id=" . $genderVal . " value=" . $genderVal . ending($genderVal);

    }

Answer 1

Change this line:

<input type='radio' name='gender' id=" . $genderVal . " value=" . $genderVal . ending($genderVal);

To this:

<input type='radio' name='gender' id=" . $genderVal . " value='" . $genderVal . "' " . ending($genderVal);